Interesting question. I haven't dated a lot of people, but I guess I feel intellectual attraction relatively easily. Emotional attraction takes longer to achieve, and I doubt it can happen during the first date. Sexual attraction varies; it can happen early or develop over time. If someone is totally my type, I can feel sexual attraction as soon as I meet them (but doesn't mean I want to have sex with them - I need emotional connection before sex). But that doesn't happen often. More likely I meet someone whose physical appearance is not "breathtaking" but "acceptable", then I feel more sexually attracted to them as I get to know them better over time.